JPH03271923A - Magnetic disk device with measures for fault control - Google Patents

Abstract

PURPOSE:To minimize the interruption of a system and the destruction of data at the time of the occurrence of a fault by providing two magnetic disks as recording mediums in a magnetic disk device and performing the automatic backup processing and the automatic switching processing in the case of the occurrence of the fault. CONSTITUTION:This device is provided with a recording part 1-1 including two magnetic disks of a master disk and a subdisk, a fault condition detecting part 1-2, and a switching control part 1-3 in fault which receives the fault information determining the access method for the recording part 1-1. Normally, the data is read out from the master disk and is equally written on the master disk and the subdisk. If I/O error occurs in the master disk, the automatic switching processing is performed by the switching control part 1-3 in fault so that the data is read out form and written in only the subdisk. Thus, the interruption of the system operation and the destruction of the data are minimized.

Description

Detailed Description of the Invention [Field of Industrial Application] In a computer system that uses a magnetic disk as the main recording medium, this device is designed to prevent the occurrence of a failure in the magnetic disk device by resetting the magnetic disk device as a recording medium.
The present invention relates to a magnetic disk device having two magnetic disks.

[Conventional technology]

Conventionally, this type of magnetic disk device is equipped with one magnetic disk as a recording medium. If data is destroyed in this magnetic disk device due to an error in the recording section or a head crash, troubleshooting measures are taken for the magnetic disk device to restore the data. Normally, data is restored by periodically copying data to a separate recording device or medium and saving it as backup data, and then copying from the backup to restore the data.

[Problem to be Solved by the Invention] In the conventional magnetic disk drive described above, when an error in the recording section or a bed crash occurs, system operation is interrupted, and system operation cannot be continued unless troubleshooting measures are completed. It is difficult to deploy, and troubleshooting requires replacing equipment and restoring data from backups, so it takes time to deal with failures, resulting in longer system operation interruptions.

[Means to solve the problem]

A magnetic disk device with failure handling processing according to the present invention includes a recording unit including two magnetic disks, a master disk and a sub disk, and receives information on input/output errors and hardware failures of the recording unit and analyzes the information. a failure situation detection unit that receives information from the failure situation detection unit and determines an access method to the recording unit; and a failure switching control unit that receives information from the failure situation detection unit and inputs an external operation instruction. a copy control unit that determines whether copying between the master disk and sub disk of the recording unit is necessary based on information from the device and information at the time of system startup; and an input/output command from the CPU and switching at the time of failure. An input/output control unit that receives information from a control unit and information from the copy control unit and accesses the recording unit, and a failure status output device that outputs failure status and operation instructions. It is composed of

〔Example〕

Next, the present invention will be explained with reference to the drawings.

As shown in FIG. 1, this device includes a recording section 1-3 in which actual data is recorded, a fault condition detection section 1-2 that detects a fault in the recording section, and a fault state detecting section 1-2 that detects a fault in the recording section. a failure switching control unit 1-3 that instructs the access method of the data storage unit, a copy control unit 1-4 that instructs copy processing, and an input/output control unit 1-5 that executes actual data input/output to the recording unit. and a failure status output device 1-6, and an operation instruction input device 1-7.
It consists of

The input/output control unit 1-5 receives input/output commands from the CPU, and instructs the recording unit 1-1 to access only the master disk if the command is an input command, or to both the master disk and sub disks if the command is an output command. conduct. If an input/output error occurs when performing this access, the failure status detection unit 1-
2 analyzes the error situation and outputs the result to the failure status output device 1-6. At the same time, if it is necessary to switch the access method to the recording unit 1-1, the failure switching control unit 1
-3, and if there is a difference between the contents of the master disk and the sub disk, an instruction is issued to the copy control unit 1-4. The failure switching control unit 1-3, which has received information about each disk from the failure status detection unit 1-2, determines whether to perform input/output to two disks, or only to the master disk or only to the sub disk. Input/output control unit 1
-Notify 5.

In addition, the copy control unit 1-4 receives information from the failure status detection unit 1-2 that there is a difference between the contents of the master disk and the subdisk, and performs copying from the master disk to the subdisk and copying from the subdisk to the master disk. Immediately after the system is started up or by an instruction from the operation instruction input device 1-7, a copy instruction is issued to the input/output control section 1-5 to control the copy processing.

Next, a specific example will be shown below.

Ilo for a magnetic disk device is that if there is no abnormality in the magnetic disk device, data is read only from the master disk, and data is written to the master disk and sub disks in the same way.

In the above state, the data on the master disk and the data on the sub disk are exactly the same.

If a (10') error occurs in the master disk during business processing, the error state is detected by the failure status detection unit, and a master disk abnormality is displayed on the failure status output device. Furthermore, at this time, the fault switching control unit automatically switches to operating only the subdisk for both reading and writing, allowing processing to continue.

When the master disk in the magnetic disk unit is replaced after the work is completed and the power is turned on again, a message indicating that the subdisk is being copied to the master disk is displayed on the operation instruction input device, and the data on the subdisk is forcibly transferred to the master disk. Copied. After the copy processing is completed, normal operation resumes. A similar operation occurs when an I10 error occurs on a subdisk.

〔Effect of the invention〕

As explained above, the present invention provides two magnetic disks as recording media in a magnetic disk device, and performs automatic backup processing and automatic switching processing when a failure occurs, thereby improving the system in the event of a failure. This has the effect of minimizing interruptions and data destruction, allowing troubleshooting to be carried out outside business hours, and facilitating data restoration.

[Brief explanation of drawings]

FIG. 1 is a block diagram of one embodiment of the present invention. 1-1...Recording unit, 1-2...Failure situation detection unit, 1-3...Failure switching control unit, 1-
4...fault status detection unit, 1-5...input/output control unit, 1-6...fault status output device, 1
-7...Fault situation input device.

Claims (1)

[Claims] a recording unit including two magnetic disks, a master disk and a sub-disk; a failure status detection unit that receives information on input/output errors and hardware failures of the recording unit and analyzes the information; and the failure status detection unit. a failure switching control unit that receives information from the storage unit and determines an access method to the recording unit; and a failure state detection unit that receives information from the failure status detection unit;
a copy control unit that determines whether copying between the master disk and sub disk of the recording unit is necessary based on information from an external operation instruction input device and information at system startup; and input/output commands from the CPU. an input/output control unit that receives information from the failure switching control unit and information from the copy control unit and accesses the recording unit; and a failure status that outputs a failure status and an operation instruction. What is claimed is: 1. A magnetic disk device with failure handling processing, characterized by comprising an output device.